The longer you use your PC, the slower its performance tends to become, which can lead to annoying system freezes and/or crashes. It's frustrating having to deal with a suddenly dysfunctional and increasingly slow computer. But there's hope in the form of key computer maintenance practices — e.g., scanning your computer for viruses and spyware, optimizing disk space and cleaning up junk files — that can speed up and improve your computer's performance. Below are seven problems and solutions to help clean, fix, and speed up your slow computer.